The excellent 853 blog reports that Blackheath's loss will be Ladywell's gain:

Blackheath, Kidbrooke and Eltham stations are set to lose their direct rail services to Victoria from December 2022, according to new documents issued by the Department for Transport today.But Bexleyheath line passengers will be able to take twice as many trains from Lewisham to Victoria, lessening the pain for passengers who complained about the possibility of losing the link.The current Victoria services will be switched to the Sidcup line, while half the trains that currently run from Hayes via Catford Bridge to Charing Cross will now run to Lewisham, Nunhead, Peckham Rye, Denmark Hill and Victoria.This brings direct trains to Victoria from stations such as Hither Green, Lee, Mottingham and New Eltham; as well as Ladywell and Lower Sydenham.